Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,285 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.255.56.0/22 | 1k | ARIN |  US | 18th Dec 2018 |
| 199.255.60.0/22 | 1k | ARIN | US | 30th May 2012 |
| 199.26.0.0/21 | 2k | ARIN | US | 15th Oct 1993 |
| 199.26.132.0/24 | 256 | ARIN | US | 28th Dec 1993 |
| 199.26.137.0/24 | 256 | ARIN | US | 28th Dec 1993 |
| 199.26.138.0/24 | 256 | ARIN | US | 28th Dec 1993 |
| 199.26.139.0/24 | 256 | ARIN | US | 28th Dec 1993 |
| 199.26.140.0/24 | 256 | ARIN | US | 28th Dec 1993 |
| 199.26.141.0/24 | 256 | ARIN | US | 28th Dec 1993 |
| 199.26.142.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.143.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.144.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.145.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.146.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.147.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.148.0/23 | 512 | ARIN | US | 29th Dec 1993 |
| 199.26.153.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.154.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 199.26.155.0/24 | 256 | ARIN | US | 30th Dec 1993 |
| 199.26.156.0/24 | 256 | ARIN | US | 30th Dec 1993 |
| 199.26.157.0/24 | 256 | ARIN | US | 30th Dec 1993 |
| 199.26.159.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.16.0/20 | 4.1k | ARIN | US | 21st Oct 1993 |
| 199.26.160.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.161.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.162.0/23 | 512 | ARIN | US | 3rd Jan 1994 |
| 199.26.164.0/24 | 256 | ARIN | US | 18th Sept 2015 |
| 199.26.165.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.166.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.170.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.171.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.173.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.174.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.175.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.177.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.178.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.179.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.180.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.182.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.185.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.26.186.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.187.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.188.0/23 | 512 | ARIN | US | 4th Jan 1994 |
| 199.26.193.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.194.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.195.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.196.0/23 | 512 | ARIN | US | 4th Jan 1994 |
| 199.26.198.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.199.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.26.200.0/24 | 256 | ARIN | US | 4th Jan 1994 |